Media type: E-Article Title: Multiple periodic solutions for problems at resonance with arbitrary eigenvalues Contributor: Habets, Patrick; Serra, Enrico; Tarallo, Massimo imprint: Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University, 1998 Published in: Topological Methods in Nonlinear Analysis Language: Not determined DOI: 10.12775/tmna.1998.043 ISSN: 1230-3429 Keywords: Applied Mathematics ; Analysis Origination: Footnote: Access State: Open Access